Space chapter 7 glossary terms

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Aamir101
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189963
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Space chapter 7 glossary terms
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2012-12-18 22:05:26
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Space chapter 7 glossary terms for MRS.Day
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  1. Celestial object
    Any object that exists in space such as a planet, star, or the moon
  2. Astronomer
    A scientest who studies astronomy
  3. Revolution
    The time it takes for an object to orbit another object; Earth revoloution around the sun
  4. Rotation
    The turning of an object around an imaginary axis running through it; Earths rotation around its axis
  5. Constelation
    A group of stars that semm to form a distinctive pattern in the sky Ex: Figure  7.7
  6. Light-year
    The distance that light travels in one year, about 9.5x1012 km
  7. Apparent magnitude
    The brightness of a star seen from Earth
  8. Asterism
    A smaller group of stars that form patterns within a constellation
  9. Pointer stars
    Pointer stars are used to find or pinpoint the location of constelations
  10. Tides
    The rising and falling of ocean waters caused by the moons and the earths gravity
  11. Phases of the moon
    The monthley progression of changes in the appearance of  the moon that result from different portions of the Moon's  sunlit side being visable from earth
  12. Lunar eclipse
    The phenomenon in which the full moon passes into earth's shadow
  13. Solar eclipse
    The phenomenon in which the shadow of the moon falls on Earths surface
  14. Why do we have seasons?
    We experience seasons because the earth is tilted at a 23.5 desgree angle, since the tilt does not change when the earth is revolving hence in the summer the northern hemisphere is towards the sun and the southers hemisphere is away from the sun in winter
  15. Planet (Include Inner and outer)
    An object that orbits one or more stars(and is not a star itself), is spherical and does not share its orbit with another object Ex: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranis, Neptune
  16. Solar system
    A group of planets that circle one or more stars
  17. Retrogated motion
    The movement of an object in the sky , usually a planet, from east to west , rather than its normal motion west to east; this effect is generaly produced when Earth is passing the planet in its orbit Ex: Figure 7.24
  18. Astronomical unit
    The average distance between Earth and the Sun, about 150x106
  19. Orbital radius
    The average distance between the Sun and an object that is orbiting the sun
  20. Geocentric model
    • A model of the solar system stating that earth is the center of all planetary motion, with the planets and the sun traveling around it in perfect circles
    • Ex: 7.4
  21. Heliocentric model
    A model of the solar system in which the sun is in the center with the orbiting planets Ex: 7.4
  22. Comet
    An object composed of rocky material, ice, and gas; comes from the Kuiper Belt or Oort cloud
  23. Asteroid
    An object in space that ranges in size from a tiny speck, like a grain of sand , to 500km wide; most asteroids originate in the asteroid belt between Mars and Jupiter
  24. Meteoride
    A piece of rock moving through space
  25. Meteor
    A meteoride that hits the earths atmosphere and burns up
  26. Meteorite
    A meteorid that is large enough to pass through earths atmosphere and reach the ground without being totally burned up
  27. Trans-Neptunian object
    An object that circles the Sun beyond the orbit of Neptune

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